Andrew Or created SPARK-13071:
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Summary: Coalescing HadoopRDD overwrites existing input metrics
Key: SPARK-13071
URL: https://issues.apache.org/jira/browse/SPARK-13071
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 2.0.0
Reporter: Andrew Or
Assignee: Andrew Or
Currently if we do the following in Hadoop 2.5+:
{code}
sc.textFile(..., 4).coalesce(2).collect()
{code}
We'll get incorrect `InputMetrics#bytesRead`. This is because HadoopRDD's
compute method overwrites any existing value of `bytesRead`, and in the case of
coalesce we'll end up calling `compute` multiple times in the same task.
This is why InputOutputMetricsSuite is failing in master, but only for
hadoop2.6/2.7:
https://amplab.cs.berkeley.edu/jenkins/job/spark-master-test-sbt-hadoop-2.7/67/
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